Add RSA PKCS#1 key load and export functions to ffi

3 files changed, 74 insertions, 0 deletions

diff --git a/src/lib/ffi/ffi.h b/src/lib/ffi/ffi.h
index 323bf54de..c1b1a1284 100644
--- a/src/lib/ffi/ffi.h
+++ b/src/lib/ffi/ffi.h
@@ -829,12 +829,20 @@ BOTAN_PUBLIC_API(2,0) int botan_privkey_load_rsa(botan_privkey_t* key,
                                      botan_mp_t q,
                                      botan_mp_t e);
 
+BOTAN_PUBLIC_API(2,0) int botan_privkey_load_rsa_pkcs1(botan_privkey_t* key,
+                                     const uint8_t bits[],
+                                     size_t len);
+
 BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_p(botan_mp_t p, botan_privkey_t rsa_key);
 BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_q(botan_mp_t q, botan_privkey_t rsa_key);
 BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_d(botan_mp_t d, botan_privkey_t rsa_key);
 BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_n(botan_mp_t n, botan_privkey_t rsa_key);
 BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_e(botan_mp_t e, botan_privkey_t rsa_key);
 
+BOTAN_PUBLIC_API(2,0) int botan_privkey_rsa_get_privkey(botan_privkey_t rsa_key,
+                                     uint8_t out[], size_t* out_len,
+                                     uint32_t flags);
+
 BOTAN_PUBLIC_API(2,0) int botan_pubkey_load_rsa(botan_pubkey_t* key,
                                     botan_mp_t n,
                                     botan_mp_t e);
diff --git a/src/lib/ffi/ffi_pkey_algs.cpp b/src/lib/ffi/ffi_pkey_algs.cpp
index 7fa06b71b..46c7e28d5 100644
--- a/src/lib/ffi/ffi_pkey_algs.cpp
+++ b/src/lib/ffi/ffi_pkey_algs.cpp
@@ -1,12 +1,14 @@
 /*
 * (C) 2015,2017 Jack Lloyd
 * (C) 2017 Ribose Inc
+* (C) 2018 René Korthaus, Rohde & Schwarz Cybersecurity
 *
 * Botan is released under the Simplified BSD License (see license.txt)
 */
 
 #include <botan/ffi.h>
 #include <botan/hash.h>
+#include <botan/pem.h>
 #include <botan/internal/ffi_util.h>
 #include <botan/internal/ffi_pkey.h>
 #include <botan/internal/ffi_rng.h>
@@ -282,6 +284,26 @@ int botan_privkey_load_rsa(botan_privkey_t* key,
 #endif
    }
 
+int botan_privkey_load_rsa_pkcs1(botan_privkey_t* key,
+                           const uint8_t bits[],
+                           size_t len)
+   {
+#if defined(BOTAN_HAS_RSA)
+   *key = nullptr;
+
+   Botan::secure_vector<uint8_t> src(bits, bits + len);
+   return ffi_guard_thunk(BOTAN_CURRENT_FUNCTION, [=]() -> int {
+      *key = new botan_privkey_struct(new Botan::RSA_PrivateKey(Botan::AlgorithmIdentifier("RSA",
+                                                                Botan::AlgorithmIdentifier::USE_NULL_PARAM),
+                                                                src));
+      return BOTAN_FFI_SUCCESS;
+      });
+#else
+   BOTAN_UNUSED(key, bits, len);
+   return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
+#endif
+   }
+
 int botan_pubkey_load_rsa(botan_pubkey_t* key,
                           botan_mp_t n, botan_mp_t e)
    {
@@ -332,6 +354,33 @@ int botan_pubkey_rsa_get_n(botan_mp_t n, botan_pubkey_t key)
    return botan_pubkey_get_field(n, key, "n");
    }
 
+int botan_privkey_rsa_get_privkey(botan_privkey_t rsa_key,
+                              uint8_t out[], size_t* out_len,
+                              uint32_t flags)
+   {
+#if defined(BOTAN_HAS_RSA)
+   return BOTAN_FFI_DO(Botan::Private_Key, rsa_key, k, {
+      if(const Botan::RSA_PrivateKey* rsa = dynamic_cast<const Botan::RSA_PrivateKey*>(&k))
+      {
+         if(flags == BOTAN_PRIVKEY_EXPORT_FLAG_DER)
+            return write_vec_output(out, out_len, rsa->private_key_bits());
+         else if(flags == BOTAN_PRIVKEY_EXPORT_FLAG_PEM)
+            return write_str_output(out, out_len, Botan::PEM_Code::encode(rsa->private_key_bits(),
+                  "RSA PRIVATE KEY"));
+         else
+            return BOTAN_FFI_ERROR_BAD_FLAG;
+      }
+      else
+      {
+         return BOTAN_FFI_ERROR_BAD_PARAMETER;
+      }
+   });
+#else
+   BOTAN_UNUSED(rsa_key, out, out_len);
+   return BOTAN_FFI_ERROR_NOT_IMPLEMENTED;
+#endif
+   }
+
 /* DSA specific operations */
 int botan_privkey_create_dsa(botan_privkey_t* key, botan_rng_t rng_obj, size_t pbits, size_t qbits)
    {
diff --git a/src/tests/test_ffi.cpp b/src/tests/test_ffi.cpp
index 9eb7847a2..45a5f0139 100644
--- a/src/tests/test_ffi.cpp
+++ b/src/tests/test_ffi.cpp
@@ -1313,6 +1313,23 @@ class FFI_Unit_Tests final : public Test
             botan_mp_destroy(e);
             botan_mp_destroy(n);
 
+            size_t pkcs1_len = 0;
+            TEST_FFI_RC(BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE,
+                  botan_privkey_rsa_get_privkey, (loaded_privkey, nullptr, &pkcs1_len, BOTAN_PRIVKEY_EXPORT_FLAG_DER));
+
+            std::vector<uint8_t> pkcs1(pkcs1_len);
+            TEST_FFI_OK(botan_privkey_rsa_get_privkey, (loaded_privkey, pkcs1.data(), &pkcs1_len, BOTAN_PRIVKEY_EXPORT_FLAG_DER));
+
+            botan_privkey_t privkey_from_pkcs1;
+            TEST_FFI_OK(botan_privkey_load_rsa_pkcs1, (&privkey_from_pkcs1, pkcs1.data(), pkcs1_len));
+            TEST_FFI_OK(botan_privkey_destroy, (privkey_from_pkcs1));
+
+            pkcs1_len = 0;
+            TEST_FFI_RC(BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE,
+                  botan_privkey_rsa_get_privkey, (loaded_privkey, nullptr, &pkcs1_len, BOTAN_PRIVKEY_EXPORT_FLAG_PEM));
+            pkcs1.resize(pkcs1_len);
+            TEST_FFI_OK(botan_privkey_rsa_get_privkey, (loaded_privkey, pkcs1.data(), &pkcs1_len, BOTAN_PRIVKEY_EXPORT_FLAG_PEM));
+
             char namebuf[32] = { 0 };
             size_t name_len = sizeof(namebuf);
             if(TEST_FFI_OK(botan_pubkey_algo_name, (loaded_pubkey, namebuf, &name_len)))